public class Example4_19 {
    public static void main (String args[]) {
        Student zhang=new Student();
        Student geng=new Student();
        zhang.setAge(23);
        System.out.println("zhang的年龄："+zhang.getAge());
        geng.setAge(25);
        System.out.println("geng的年龄："+geng.getAge());
    }
}
